Viessmann VITOCAL 200-G, Installation And Service Instructions Manual

Page: 146 / 208

The set flow temperature of the secondary circuit is determined by the control
unit in accordance with the current heat demand.
The "
flow hysteresis " setting defines the difference from an internally calcu-
lated set flow temperature at which one of the heat generators (heat pump,
instantaneous heating water heater) is switched on and off.
Access
& " Device settings "
& " Programming "
& " Internal hydraulics "
& "Flow hysteresis" (
0
/
=
)
Standard setting 2 K
Setting range 0.5 to 5.0 K
Internal pump run-on
Secondary pump run-on, after the heat generation by the heat pump or the
instantaneous heating water heater has been stopped.
Access
& " Device settings "
&
" Programming "
&
" Internal hydraulics "
&
"Int. pump run-on" (
P
/
Q
)
Standard setting 02:00 min
Setting range 00:10 to
05:00 min
Max. steps; three-way valve
Subject to the type of the three-way valve, the number of step pulses varies that
the motor requires to drive the valve from one end stop to the opposite one.
This parameter will only need to be adjusted if the three-way valve has been
replaced.
In the delivered condition, the number of step pulses is correctly adjusted.
Note
To activate the modified settings, first switch the system OFF and then ON
again at the system ON/OFF switch.
Flow hysteresis
146
Internal hydraulics control settings
55
92
968
GB